J-MARK COMPUTER CORPORATION
J-791BS
| Device Type | Mainboard |
| Processor | Pentium II |
| Processor Speed | 233/266/300/333/350/400/450MHz |
| Chip Set | VIA Apollo |
| Maximum Onboard Memory | 512MB (EDO & SDRAM supported) |
| Audio Chip Set | Unidentified |
| Cache | 256/512KB (located on Pentium II CPU) |
| BIOS | Award |
| Dimensions | 230mm x 220mm |
| I/O Options | 32-bit PCI slots (3), floppy drive interface, game interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse interface, serial ports (2), IR connector, USB connectors, ATX power connector, AGP slot, audio in – CD-ROMs (2), wake on LAN connector |
CONNECTIONS |
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| Purpose | Location |
Purpose | Location |
| AGP slot | AGP |
Audio in – CD-ROM | J3 |
| ATX power connector | ATX |
Audio in – CD-ROM | J4 |
| IDE interface LED | C1 |
Digital line out | J5/pins 1 & 2 |
| Soft off power supply | C2 |
Digital line in | J5/pins 3 & 4 |
| CPU fan power | C3 |
Audio connector | J6 |
| Chassis fan power | C4 |
Speaker | J9A |
| PS/2 mouse interface | CN1 |
Reset switch | J9B |
| Serial port 1 | CN2 |
Turbo LED | J9C |
| Serial port 2 | CN3 |
Power LED & keylock | J9D |
| Parallel port | CN4 |
Turbo switch | J9E |
| Floppy drive interface | CN5 |
Game interface | JP2 |
| IDE interface 2 | CN6 |
32-bit PCI slots | PC1 – PC3 |
| IDE interface 1 | CN7 |
USB connector | USB |
| IR connector | IR1 |
Wake on LAN connector | WOL |
USER CONFIGURABLE SETTINGS |
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Function |
Label |
Position |
|
» |
Factory configured - do not alter | J7 |
Unidentified |
| PS/2 mouse IRQ12 enabled | JMS |
Pins 1 & 2 closed |
|
| PS/2 mouse IRQ12 disabled | JMS |
Pins 2 & 3 closed |
|
» |
Factory configured - do not alter | JP1 |
Unidentified |
» |
Factory configured - do not alter | JP3 |
Unidentified |
» |
CMOS memory normal operation | JUB |
Pins 1 & 2 closed |
| CMOS memory clear | JUB |
Pins 2 & 3 closed |
|
DIMM CONFIGURATION |
||
Size |
Bank 0 |
Bank 1 |
8MB |
(1) 1M x 64 |
None |
16MB |
(1) 2M x 64 |
None |
16MB |
(1) 1M x 64 |
(1) 1M x 64 |
24MB |
(1) 2M x 64 |
(1) 1M x 64 |
32MB |
(1) 4M x 64 |
None |
32MB |
(1) 2M x 64 |
(1) 2M x 64 |
40MB |
(1) 4M x 64 |
(1) 1M x 64 |
48MB |
(1) 4M x 64 |
(1) 2M x 64 |
64MB |
(1) 8M x 64 |
None |
64MB |
(1) 4M x 64 |
(1) 4M x 64 |
72MB |
(1) 8M x 64 |
(1) 1M x 64 |
80MB |
(1) 8M x 64 |
(1) 2M x 64 |
96MB |
(1) 8M x 64 |
(1) 4M x 64 |
128MB |
(1) 8M x 64 |
(1) 8M x 64 |
128MB |
(1) 16M x 64 |
None |
136MB |
(1) 16M x 64 |
(1) 1M x 64 |
144MB |
(1) 16M x 64 |
(1) 2M x 64 |
160MB |
(1) 16M x 64 |
(1) 4M x 64 |
192MB |
(1) 16M x 64 |
(1) 8M x 64 |
256MB |
(1) 16M x 64 |
(1) 16M x 64 |
DIMM CONFIGURATION (CON’T) |
||
Size |
Bank 0 |
Bank 1 |
256MB |
(1) 32M x 64 |
None |
264MB |
(1) 32M x 64 |
(1) 1M x 64 |
272MB |
(1) 32M x 64 |
(1) 2M x 64 |
288MB |
(1) 32M x 64 |
(1) 4M x 64 |
320MB |
(1) 32M x 64 |
(1) 8M x 64 |
384MB |
(1) 32M x 64 |
(1) 16M x 64 |
512MB |
(1) 32M x 64 |
(1) 32M x 64 |
| Note: Board accepts EDO & SDRAM memory. | ||
CACHE CONFIGURATION |
| Note: 256KB/512KB cache is located on the Pentium II CPU. |
CPU SPEED SELECTION |
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CPU speed |
Clock speed |
Multiplier |
SW1/1 |
SW1/2 |
SW1/3 |
SW1/4 |
233MHz |
66MHz |
3.5x |
Off |
Off |
Off |
Off |
266MHz |
66MHz |
4x |
Off |
Off |
Off |
Off |
300MHz |
66MHz |
4.5x |
Off |
Off |
Off |
Off |
333MHz |
66MHz |
5x |
Off |
Off |
Off |
Off |
350MHz |
100MHz |
3.5x |
Off |
Off |
On |
Off |
400MHz |
100MHz |
4x |
Off |
Off |
On |
Off |
450MHz |
100MHz |
4.5x |
Off |
Off |
On |
Off |
CPU SPEED SELECTION (CON’T) |
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CPU speed |
Clock speed |
Multiplier |
U8/1 |
U8/2 |
U8/3 |
U8/4 |
233MHz |
66MHz |
3.5x |
On |
Off |
Off |
On |
266MHz |
66MHz |
4x |
Off |
On |
On |
On |
300MHz |
66MHz |
4.5x |
Off |
On |
Off |
On |
333MHz |
66MHz |
5x |
Off |
Off |
On |
On |
350MHz |
100MHz |
3.5x |
On |
Off |
Off |
On |
400MHz |
100MHz |
4x |
Off |
On |
On |
On |
450MHz |
100MHz |
4.5x |
Off |
On |
Off |
On |